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Takayuki Iwasaki,Kazuo Ogura,Shota Magori,Junpei Kojima,Kiyoyuki Yambe 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
Smith-Purcell (SP) radiations of weakly relativistic oversized backward wave oscillator (BWO)are examined experimentally. A bunching section composed of a coaxial slow wave structure withinner K-band corrugation is placed upstream from the oversized BWO. An annular beam lessthan 100 kV is self-bunched in the bunching section and then excites the oversized BWO. SPradiations are examined by using 25.5- and 45.0-GHz oversized BWOs. The beam is too far awayfrom the walls of the oversized BWO for SP radiation to occur without the self-bunching. Whenthe corrugation parameters of the bunching section are the same as those of the oversized BWO,enhanced SP radiations in the frequency region above the surface wave are observed even when thebeam propagates outside the interaction region of the surface wave.
Radio-photoluminescence observed in non-doped Mg2SiO4 single crystal
Go Okada,Takahiro Kojima,Jisaburo Ushizawa,Noriaki Kawaguchi,Takayuki Yanagida 한국물리학회 2017 Current Applied Physics Vol.17 No.3
The aim of this research is to investigate radiation-induced luminescence of non-doped Mg2SiO4 single crystal. The Mg2SiO4 single crystals were synthesized by the Czochralski process. The obtained crystal samples were studied to characterize the radio-photoluminescence (RPL), radio-luminescence (RL), and thermally-stimulated luminescence (TSL) properties. A non-irradiated (or as-prepared) sample shows no particular PL features whereas X-ray treated sample shows a broad PL emission around 630 nm under excitation at 270 nm. The latter observation indicates that RPL centre has been generated by X-ray irradiation. The X-ray induced RL can be observed due to the RPL centre around 630 nm, and the intensity monotonically increases with accumulating the incident radiation dose. TSL glow curve consists of three peaks at 160, 260, and 390 C, and the initial rise method derived the activation energies of 1.33, 1.47, and 1.85 eV, respectively. The first two TSL are associated with some shallow trapping centres, and annealing at this temperature range builds up the RPL response. On the other hand, annealing at higher temperatures supresses the RPL response; thus, the RPL centre is located at deeper site.
Chen, Wen-Tong,Yamada, Yusuke,Liu, Guang-Ning,Kubota, Akira,Ichikawa, Takayuki,Kojima, Yoshitsugu,Guo, Guo-Cong,Fukuzumi, Shunichi Royal Society of Chemistry 2011 Dalton transactions Vol.40 No.48
<P>The crystal structure of an N<SUB>2</SUB>-encapusulated MOF, which is stable under open-air conditions at ambient temperature, was determined by single-crystal X-ray diffraction at 123 K. The crystal MOF of [HSm{V<SUP>IV</SUP>O(TPPS)}]<SUB><I>n</I></SUB> designed to have 1-D channels periodically constricted by porphyrins planes adsorbed N<SUB>2</SUB> at 77 K. The adsorbed N<SUB>2</SUB> molecules remained in the 1-D channels even after warming to ambient temperature. The single-crystal structure of [HSm{V<SUP>IV</SUP>O(TPPS)}]<SUB><I>n</I></SUB>⊃N<SUB>2</SUB> determined by X-ray diffraction indicated that N<SUB>2</SUB> molecules trapped in the constricted parts block other N<SUB>2</SUB> molecules in 1-D channels from escaping from the MOF. Such a unique encapsulation mode provides a promising approach toward designing novel MOFs with high gas storage capacity at ambient temperature.</P> <P>Graphic Abstract</P><P>The shrinking of a channel window to fit the size of stopper molecules enables encapsulation of adsorbates in the 1-D channels. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1dt10956a'> </P>